'First Lady of the West' Linda Lael Miller is a fixture atop the New York Times bestseller list. In Big Sky Summer, Casey Elder returns to Parable, Montana, with the two teenage secrets born from a spur-of-the-moment dalliance with big-time rancher Walker Parrish. For the sake of the kids, Casey and Walker agree to a marriage of convenience--but when passions stir, an already touchy situation gets a whole lot more complicated.